1. Structure of Atom 1 GRADE 11 2. DISCOVERY OF AN ELECTRON  An electron was discovered by cathode ray discharge tubes experiment.  A cathode ray tube is made of glass…

1. Structure Of AtOm clASS -9(cbSc) 2. The existence of different kinds of matter is due to different atoms constituting them. Two questions arise: (i) What makes the atom…

Atomic Model Timeline http://www.cs.utah.edu/~draperg/cartoons/jb/bohring.gif 400BC Democritus Democritus found that atoms are not all the same, they are eternal, and always…

1. CHAPTER - 4 STRUCTURE OF THE ATOM CLASS :- IX MADE BY :- SHIVA PRASAD SCHOOL :- K.V. 2, SADRAS , KALPAKKAM 2. 1a) Charged particles in matter :- Atoms have three types…

Slide 1 Lecture 7: Mass Spectrometry, Instrumental In mass spectrometry, components of a mixture are transferred to the gas phase (if they’re not already there) and separated…

Slide 1 Chapter 3 Atoms and Moles Slide 2 Atomic Models Slide 3 3.1 Matter Made of Atoms  Atomic Theory  Mikhail Lomonosov (1711-1795) and Antoine Lavosier (1743- 1794):…

Slide 1Sir William Crookes Slide 2 Personal Life Born on June 17, 1832 in London Enrolled at the Royal College of Chemistry at the age of 15 ! He became superintendent of…

Slide 1 Atomic Model Timeline http://www.cs.utah.edu/~draperg/cartoons/jb/bohring.gif Slide 2 400BC Democritus Democritus found that atoms are not all the same, they are…

Slide 1 Atomic Structure Slide 2 Scientific Modeling A.Scientists develop models to explain things they cannot directly observe Slide 3 Slide 4 B. Models of Atoms are based…

Atomic Theory Past and Present A. Democritus (400 BCE) Matter is made up of particles called âatomosâ or atoms http://www.timelineindex.com/content/view/1228 I. Early Atomic…